fibroid tumor vs fibroid

fibroid tumor and fibroid both are nouns.

Word	Noun	Adjective	Verb	Adverb
fibroid tumor	Yes	No	No	No
fibroid	Yes	No	No	No

As nouns, fibroid tumor and fibroid are synonyms defined as:

fibroid tumor and fibroid: benign tumor containing fibrous tissue (especially in the uterus)

fibroid tumor (noun)	fibroid (noun)
benign tumor containing fibrous tissue (especially in the uterus)	benign tumor containing fibrous tissue (especially in the uterus)