In linguistics, a collective noun is a word referring to a collection of things taken as a whole. Most collective nouns in everyday speech are not specific to one kind of thing. For example, the collective noun "group" can be applied to people ("a group of people"), or dogs ("a group of dogs"), or objects ("a group of stones").
Some collective nouns are specific to one kind of thing, especially terms of venery, which identify groups of specific animals. For example, "pride" as a term of venery always refers to lions, never to dogs or cows. Other examples come from popular culture such as a group of owls, which is called a "parliament".
Different forms of English handle verb agreement with collective count nouns differently. For example, users of British English generally accept that collective nouns take either singular or plural verb forms depending on context and the metonymic shift that it implies.
Morphological derivation accounts for many collective words and various languages have common affixes for denoting collective nouns. Because derivation is a slower and less productive word formation process than the more overtly syntactical morphological methods, there are fewer collectives formed this way. As with all derived words, derivational collectives often differ semantically from the original words, acquiring new connotations and even new denotations.
Early Proto-Indo-European used the suffix *eh2 to form collective nouns, which evolved into the Latin neuter plural ending -a. Late Proto-Indo-European used the ending *t, which evolved into the English ending -th, as in "youth".
The English endings -age and -ade often signify a collective. Sometimes, the relationship is easily recognizable: baggage, drainage, blockade. Though the etymology is plain to see, the derived words take on a distinct meaning. This is a productive ending, as evidenced in the recent coin, "signage".
German uses the prefix ge- to create collectives. The root word often undergoes umlaut and suffixation as well as receiving the ge- prefix.