fat cell vs vegetative cell

fat cell and vegetative cell both are nouns.

Word	Noun	Adjective	Verb	Adverb
fat cell	Yes	No	No	No
vegetative cell	Yes	No	No	No

As nouns, vegetative cell is a hypernym of fat cell; that is, vegetative cell is a word with a broader meaning than fat cell:

fat cell: cells composed of fat
vegetative cell: any of the cells of a plant or animal except the reproductive cells; a cell that does not participate in the production of gametes

Other hypernyms of fat cell include somatic cell.

fat cell (noun)	vegetative cell (noun)
cells composed of fat	any of the cells of a plant or animal except the reproductive cells; a cell that does not participate in the production of gametes