specialize

(verb) become more focus on an area of activity or field of study. Synonyms: specialise, narrow, narrow down. Example: "She specializes in near eastern history."

(verb) be specific about. Synonyms: specify, particularize, particularise, specialise. Example: "Could you please specify your criticism of my paper?."

(verb) suit to a special purpose. Synonyms: specialise. Examples: "Specialize one's research." "This kind of beak has become specialized in certain galapagos finches."

(verb) devote oneself to a special area of work. Synonyms: specialise. Examples: "She specializes in honey bees." "This baker specializes in french bread."

(verb) evolve so as to lead to a new species or develop in a way most suited to the environment. Synonyms: speciate, differentiate, specialise.