bear vs piggyback

bear and piggyback both are nouns.

Word	Noun	Adjective	Verb	Adverb
bear	Yes	No	Yes	No
piggyback	Yes	No	Yes	Yes

As verbs, piggyback is a hyponym of bear; that is, piggyback is a word with a more specific, narrower meaning than bear:

Other hyponyms of bear include acquit, act, bear, behave, carry, comport, conduct, deport, do, sling, stoop, balance, poise.

bear (noun)	piggyback (noun)
massive plantigrade carnivorous or omnivorous mammals with long shaggy coats and strong claws	the act of carrying something piggyback
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

bear (verb)	piggyback (verb)
be pregnant with	bring into alignment with
cause to be born	support on the back and shoulders
have on one's person	haul by railroad car
behave in a certain manner; show a certain behavior; conduct or comport oneself	haul truck trailers loaded with commodities on railroad cars
put up with something or somebody unpleasant	ride on someone's shoulders or back
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

bear (adverb)	piggyback (adverb)
	on the back or shoulder or astraddle on the hip
	on a railroad flatcar