S: (n) form, variant, strain, var. ((biology) a group of organisms within a species that differ in trivial ways from similar groups) "a new strain of microorganisms"
W: (v) vary [Related to: variate] (be subject to change in accordance with a variable) "Prices vary"; "His moods vary depending on the weather"
S: (n) version, variant, variation, edition (something a little different from others of the same type) "an experimental version of the night fighter"; "a variant of the same word"; "an emery wheel is the modern variation of a grindstone"; "the boy is a younger edition of his father"
S: (n) type (a subdivision of a particular kind of thing) "what type of sculpture do you prefer?"
S: (n) kind, sort, form, variety (a category of things distinguished by some common characteristic or quality) "sculpture is a form of art"; "what kinds of desserts are there?"
S: (n) category (a general concept that marks divisions or coordinations in a conceptual scheme)