Synonyms for Co-operative:

adj.

accommodating (adjective)
friendly.
agreeable (adjective)
amiable, willing, compatible, understanding, agreeable, likeable, friendly, congenial, acquiescent, harmonious, pleasant, Capitulating, consensual, concordant, assenting, empathetic.
appreciative (adjective)
understanding.
co-operative (adjective)
collective, co-active, common, bilateral, coefficient, collusive, shared, co-operating, collaborative, mutual.
collective (adjective)
mutual.
compatible (adjective)
congenial.
congenial (adjective)
agreeable, compatible, pleasant.
cooperative (adjective)
collaborative, coefficient, harmonious, common, shared, collusive, collective.
neighborly (adjective)
amiable.
obliging (adjective)
willing.
participatory (adjective)
shared, participatory.
united (adjective)
concordant.

n.

co-operative (noun)
shared, collective, willing, collaborative.

Other synonyms:

adj.
participatory.