penchant vs weakness

penchant and weakness both are nouns.

Word	Noun	Adjective	Verb	Adverb
penchant	Yes	No	No	No
weakness	Yes	No	No	No

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

Other hyponyms of penchant include acquired taste.

penchant (noun)	weakness (noun)
a strong liking	the property of lacking physical or mental strength; liability to failure under pressure or stress or strain
	powerlessness revealed by an inability to act
	a penchant for something even though it might not be good for you
	a flaw or weak point
	the condition of being financially weak