A collective noun names a group as a single grammatical unit. Ejército, rebaño, enjambre y equipo point to several beings or elements, but the word functions as a single noun. For that reason it can appear in a sentence like any other noun: The team won, The herd crossed, The people left. The central idea is not an individual, but the whole group. As with other Sustantivos, the collective can be the subject, object or complement within the sentence.

Many collective nouns are singular even though they denote several beings. La bandada can refer to many birds, la manada to several animals and la familia to several people. The singular is the form of the noun, not an indication that there is only one person, animal, or thing. Context clarifies which group is being named: La bandada voló hacia el sur does not talk about a single bird, but about many. In Spanish, nominal number does not always align with the real quantity we imagine, as also seen in Número Nominal.

The collective noun usually takes determiners and adjectives in singular because agreement is with the word, not with the members of the group. We say el rebaño grande, esa multitud tranquila, mi familia unida. The determiner marks the gender and number of the collective noun, and the adjective agrees with that form: la tripulación cansada, el alumnado atento. If the collective noun changes number, the elements that accompany it also change: las familias numerosas, los equipos rivales. This concordance works the same as with other nouns, including the Sustantivos contables and the Sustantivos Incontables, according to their behavior in the sentence.

In everyday speech there are many useful collectives. For people: familia, gente, multitud, pareja, grupo, equipo, clase, alumnado. For animals: rebaño, manada, bandada, cardumen, enjambre. For things: montón, colección, flota, bosque, racimo. Each one names a different set and is used in concrete contexts: La clase entró al aula, La flota llegó al puerto, Un cardumen nadaba cerca de la orilla. These nouns allow talking about groups without listing each member one by one.

A collective noun can be put in plural when we talk about more than one group. Las familias names several family units, not more people inside a single family. Los rebaños are several groups of animals. Las flotas are several sets of boats. In these sentences, the plural applies to the whole collective noun and the agreement changes with it: Las bandadas pasaron, Los equipos entrenaron. The sense remains that of a group, but now there are several separate groups. The plural form does not undo the collective idea; it only multiplies it.

Some collective nouns are common across Spanish, and others are cultured, regional or less common. Alumnado, vecindario and cillero are not used the same everywhere or in all situations. There are also collectives very known in one region and uncommon in another. The general meaning stays the same, but usage preferences change according to region, register or local tradition. In formal texts more cultured collectives may appear, while in everyday conversation more common forms tend to dominate. The sense is learned best by seeing how each word is used in real context.

parvadapatotabandadapiara

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Conjunto de aves muy común para nombrar un grupo que vuela unidoConjunto de cerdos que se usa mucho en el español general de EspañaGrupo de aves que vuela o se reúne junto, con uso muy frecuente en MéxicoGrupo de personas usado en algunos contextos regionales para una pandilla o grupo informal

Variantes regionales de algunos colectivos

Region	Variant	Definition	Example
Spain	piara	Group of pigs that is widely used in general Spanish of Spain.	La piara se revolcó feliz en el barro.
Mexico	parvada	Group of birds that flies or gathers together, with very frequent use in Mexico.	Una parvada cruzó el cielo como si llevara uniforme.
Argentina	patota	Group of people used in some regional contexts for a gang or informal group.	La patota del barrio llegó con guitarras y naranjas.
Colombia	bandada	Group of birds very common to name a group flying together.	Una bandada de loros invadió el almuerzo.

Scramble

Some collective nouns have a fixed value that is not interpreted literally word by word. Gente names people as a group, but not an exact sum nor a closed group. Arboleda suggests a set of trees, even though it does not allow counting how many there are without more information. Mobiliario gathers furniture as a single idea. The real context decides the scope of the collective: La gente esperaba afuera speaks of several people without specifying how many, while la arboleda del parque presents the trees as a set. In each case, the collective noun provides a unitary image of the group, not a list of separate elements.