atheroma vs fatty tissue

atheroma and fatty tissue both are nouns.

Word	Noun	Adjective	Verb	Adverb
atheroma	Yes	No	No	No
fatty tissue	Yes	No	No	No

As nouns, fatty tissue is a hypernym of atheroma; that is, fatty tissue is a word with a broader meaning than atheroma:

atheroma: a fatty deposit in the intima (inner lining) of an artery; can obstruct blood flow
fatty tissue: a kind of body tissue containing stored fat that serves as a source of energy; it also cushions and insulates vital organs

Other hypernyms of atheroma include adipose tissue, fat.

atheroma (noun)	fatty tissue (noun)
a fatty deposit in the intima (inner lining) of an artery; can obstruct blood flow	a kind of body tissue containing stored fat that serves as a source of energy; it also cushions and insulates vital organs