spe·cial·ism 
(spĕshə-lĭz′əm)
(spĕshə-lĭz′əm)n.
1. Concentration of one's efforts in a given occupation or field of study.
2. A field of specialization.
- phytic acid
- phyto-
- phytochemical
- phytochemically
- phytochemist
- phytochemistry
- phytochrome
- phytoestrogen
- phytogenesis
- phytogenetic
- phytogenetical
- phytogenetically
- phytogenic
- phytogenous
- phytogeny
- phytogeographer
- phytogeographic
- phytogeographical
- phytogeography
- phytography
- phytohemagglutinin
- phytohormone
- phytol
- phytolith
- phytologic