fibroid vs fibroid tumor

fibroid and fibroid tumor both are nouns.

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

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

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

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