attitude vs decubitus

attitude and decubitus both are nouns.

Word	Noun	Adjective	Verb	Adverb
attitude	Yes	No	No	No
decubitus	Yes	No	No	No

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

attitude (noun)	decubitus (noun)
a theatrical pose created for effect	a reclining position (as in a bed)
the arrangement of the body and its limbs
a complex mental state involving beliefs and feelings and values and dispositions to act in certain ways
position of aircraft or spacecraft relative to a frame of reference (the horizon or direction of motion)