lankiness vs habitus

lankiness and habitus both are nouns.

Word	Noun	Adjective	Verb	Adverb
lankiness	Yes	No	No	No
habitus	Yes	No	No	No

As nouns, habitus is a hypernym of lankiness; that is, habitus is a word with a broader meaning than lankiness:

Other hypernyms of lankiness include body-build, build, physique.

lankiness (noun)	habitus (noun)
a tall and thin physique	constitution of the human body
	person's predisposition to be affected by something (as a disease)