HRT vs hormone-replacement therapy

HRT and hormone-replacement therapy both are nouns.

Word	Noun	Adjective	Verb	Adverb
HRT	Yes	No	No	No
hormone-replacement therapy	Yes	No	No	No

As nouns, HRT and hormone-replacement therapy are synonyms defined as:

HRT and hormone-replacement therapy: hormones (estrogen and progestin) are given to postmenopausal women; believed to protect them from heart disease and osteoporosis

Other synonyms of HRT include hormone replacement therapy.

HRT (noun)	hormone-replacement therapy (noun)
hormones (estrogen and progestin) are given to postmenopausal women; believed to protect them from heart disease and osteoporosis	hormones (estrogen and progestin) are given to postmenopausal women; believed to protect them from heart disease and osteoporosis