preinvasive cancer vs carcinoma in situ

preinvasive cancer and carcinoma in situ both are nouns.

Word	Noun	Adjective	Verb	Adverb
preinvasive cancer	Yes	No	No	No
carcinoma in situ	Yes	No	No	No

As nouns, preinvasive cancer and carcinoma in situ are synonyms defined as:

preinvasive cancer and carcinoma in situ: a cluster of malignant cells that has not yet invaded the deeper epithelial tissue or spread to other parts of the body

preinvasive cancer (noun)	carcinoma in situ (noun)
a cluster of malignant cells that has not yet invaded the deeper epithelial tissue or spread to other parts of the body	a cluster of malignant cells that has not yet invaded the deeper epithelial tissue or spread to other parts of the body