What is a Guild?

a medieval* association of craftsmen or merchants, often having considerable power.

an association of people for mutual aid or the pursuit of a common goal.

synonyms: association, society, union, league, organization, company, cooperative, fellowship, club, order, lodge, brotherhood, fraternity, sisterhood, sorority

“the copper craftsmen have formed a guild”

ECOLOGY
a group of species that have similar requirements and play a similar role within a community.

*We are only medieval once in a while. 😉