1) Alter 2) Be specific about 3) Change 4) Major in 5) Narrow 6) Narrow down 7) Specialise 8) Suit to a special purpose 9) To go into specific details 10) To narrow in scope 11) Vary Found on https://www.crosswordclues.com/clue/specialize
• (v. t.) To apply to some specialty or limited object; to assign to a specific use; as, specialized knowledge. • (v. t.) To supply with an organ or organs having a special function or functions. • (v. t.) To mention specially; to particularize. Found on http://thinkexist.com/dictionary/meaning/specialize/
Spe'cial·ize transitive verb 1. To mention specially; to particularize. 2. To apply to some specialty or limited object; to assign to a specific use; as, specialized knowledge. 3. (Biol.) To supply with an organ or organs having a special function or functions. ... Found on http://www.encyclo.co.uk/webster/S/157