specialize, specialise -- (suit to a special purpose; "specialize one's research"; "this kind of beak has become specialized in certain Galapagos finches")
specialize, specialise -- (devote oneself to a special area of work; "She specializes in honey bees"; "This baker specializes in French bread")
speciate, differentiate, specialize, specialise -- (evolve so as to lead to a new species or develop in a way most suited to the environment)