jamb vs doorjamb

jamb and doorjamb both are nouns.

Word	Noun	Adjective	Verb	Adverb
jamb	Yes	No	No	No
doorjamb	Yes	No	No	No

As nouns, doorjamb is a hyponym of jamb; that is, doorjamb is a word with a more specific, narrower meaning than jamb:

jamb: upright consisting of a vertical side member of a door or window frame
doorjamb: a jamb for a door

Other hyponyms of jamb include doorpost.

jamb (noun)	doorjamb (noun)
upright consisting of a vertical side member of a door or window frame	a jamb for a door