sub·spe·cial·ize 
(sŭb′spĕshə-līz′)
(sŭb′spĕshə-līz′)intr.v. sub·spe·cial·ized, sub·spe·cial·iz·ing, sub·spe·cial·iz·es
To have or pursue a subspecialty: subspecialize in cosmetic surgery.
sub·special·ist (-spĕshə-lĭst) n.
sub·spe′cial·i·zation (-spĕsh′ə-lĭ-zāshən) n.
- sprightly
- spring
- spring a leak
- spring beauty
- springboard
- springbok
- springbuck
- spring chicken
- spring-cleaning
- springe
- spring ephemeral
- springer
- springerle
- springer spaniel
- spring fever
- Springfield
- Springfield rifle
- springform pan
- springhare
- springhead
- springhouse
- springily
- springiness
- springing
- springing line