soft spot vs porta

soft spot and porta both are nouns.

Word	Noun	Adjective	Verb	Adverb
soft spot	Yes	No	No	No
porta	Yes	No	No	No

As nouns, porta is a hypernym of soft spot; that is, porta is a word with a broader meaning than soft spot:

soft spot: any membranous gap between the bones of the cranium in an infant or fetus
porta: an aperture or hole that opens into a bodily cavity

Other hypernyms of soft spot include opening, orifice.

soft spot (noun)	porta (noun)
a place of especial vulnerability	an aperture or hole that opens into a bodily cavity
any membranous gap between the bones of the cranium in an infant or fetus
a sentimental affection