pavilion vs collapsible shelter

pavilion and collapsible shelter both are nouns.

Word	Noun	Adjective	Verb	Adverb
pavilion	Yes	No	No	No
collapsible shelter	Yes	No	No	No

As nouns, collapsible shelter is a hypernym of pavilion; that is, collapsible shelter is a word with a broader meaning than pavilion:

pavilion: large and often sumptuous tent
collapsible shelter: a portable shelter (usually of canvas stretched over supporting poles and fastened to the ground with ropes and pegs)

Other hypernyms of pavilion include tent.

pavilion (noun)	collapsible shelter (noun)
large and often sumptuous tent	a portable shelter (usually of canvas stretched over supporting poles and fastened to the ground with ropes and pegs)