have a bun in the oven vs bear

have a bun in the oven is not a noun while bear is a noun.

Word	Noun	Adjective	Verb	Adverb
have a bun in the oven	No	No	Yes	No
bear	Yes	No	Yes	No

As verbs, have a bun in the oven and bear are synonyms defined as:

Other synonyms of have a bun in the oven include carry, expect, gestate.

As verbs, bear is a hypernym of have a bun in the oven; that is, bear is a word with a broader meaning than have a bun in the oven:

Other hypernyms of have a bun in the oven include birth, deliver, give birth, have.

have a bun in the oven (noun)	bear (noun)
	massive plantigrade carnivorous or omnivorous mammals with long shaggy coats and strong claws
	an investor with a pessimistic market outlook; an investor who expects prices to fall and so sells now in order to buy later at a lower price

have a bun in the oven (verb)	bear (verb)
be pregnant with	be pregnant with
	cause to be born
	have on one's person
	behave in a certain manner; show a certain behavior; conduct or comport oneself
	put up with something or somebody unpleasant
	move while holding up or supporting
	support or hold in a certain manner
	bring forth
	maintain (a theory, thoughts, or feelings)
	have rightfully; of rights, titles, and offices
	bring in
	take on as one's own the expenses or debts of another person
	have
	contain or hold; have within