specialize

verb

1. become more focused on an area of activity or field of study"She specializes in Near Eastern history"
2. be specific about"Could you please specify your criticism of my paper?"
3. suit to a special purpose"specialize one's research"
4. devote oneself to a special area of work"She specializes in honey bees"
5. evolve so as to lead to a new species or develop in a way most suited to the environment