upright vs structural member

upright and structural member both are nouns.

Word	Noun	Adjective	Verb	Adverb
upright	Yes	Yes	No	No
structural member	Yes	No	No	No

As nouns, structural member is a hypernym of upright; that is, structural member is a word with a broader meaning than upright:

upright: a vertical structural member as a post or stake
structural member: support that is a constituent part of any structure or building

upright (noun)	structural member (noun)
a piano with a vertical sounding board	support that is a constituent part of any structure or building
a vertical structural member as a post or stake

upright (adjective)	structural member (adjective)
upright in position or posture
of moral excellence
in a vertical position; not sloping