bow vs give in

bow is a noun but give in is not a noun.

Word	Noun	Adjective	Verb	Adverb
bow	Yes	No	Yes	No
give in	No	No	Yes	No

As verbs, bow and give in are synonyms defined as:

Other synonyms of bow include accede, defer, submit.

As verbs, give in is a hypernym of bow; that is, give in is a word with a broader meaning than bow:

Other hypernyms of bow include buckle under, knuckle under, succumb, yield.

bow (noun)	give in (noun)
a stroke with a curved piece of wood with taut horsehair strands that is used in playing stringed instruments
a slightly curved piece of resilient wood with taut horsehair strands; used in playing certain stringed instruments
a weapon for shooting arrows, composed of a curved piece of resilient wood with a taut cord to propel the arrow
a knot with two loops and loose ends; used to tie shoelaces
a decorative interlacing of ribbons
something curved in shape
front part of a vessel or aircraft
an appearance by actors or performers at the end of the concert or play in order to acknowledge the applause of the audience
bending the head or body or knee as a sign of reverence or submission or shame or greeting

bow (verb)	give in (verb)
bend one's knee or body, or lower one's head	consent reluctantly
yield to another's wish or opinion	yield to another's wish or opinion
bend the head or the upper part of the body in a gesture of respect or greeting
bend one's back forward from the waist on down
play on a stringed instrument with a bow