| noun | the act of specializing; making something suitable for a special purpose |
| noun | the special line of work you have adopted as your career “his specialization is gastroenterology” |
| noun | (biology) the structural adaptation of some body part for a particular function “cell differentiation in the developing embryo” |
| specialize | verb | suit to a special purpose |
| specialise | verb | suit to a special purpose |
| specialist | noun | practices one branch of medicine |
| differentiate | verb | become different during development |