WordNet sense 1 ((chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight):

chemical compound

WordNet sense 2 (composed of many distinct individuals united to form a whole or colony):

colonial

WordNet sense 3 (combine so as to form a whole; mix):

combine, combine

WordNet sense 4 (make more intense, stronger, or more marked):

deepen, heighten, intensify