invagination vs intussusception

invagination and intussusception both are nouns.

Word	Noun	Adjective	Verb	Adverb
invagination	Yes	No	No	No
intussusception	Yes	No	No	No

As nouns, invagination and intussusception are synonyms defined as:

invagination and intussusception: the folding in of an outer layer so as to form a pocket in the surface

Other synonyms of invagination include infolding, introversion.

invagination (noun)	intussusception (noun)
the folding in of an outer layer so as to form a pocket in the surface	(biology) growth in the surface area of a cell by the deposit of new particles between existing particles in the cell wall
the condition of being folded inward or sheathed	the folding in of an outer layer so as to form a pocket in the surface