endometrium vs womb

endometrium and womb both are nouns.

Word	Noun	Adjective	Verb	Adverb
endometrium	Yes	No	No	No
womb	Yes	No	No	No

endometrium (noun)	womb (noun)
(pregnancy) the mucous membrane that lines the uterus; thickens under hormonal control and (if pregnancy does not occur) is shed in menstruation; if pregnancy occurs it is shed along with the placenta at parturition	a hollow muscular organ in the pelvic cavity of females; contains the developing fetus