spider web vs orb web

spider web and orb web both are nouns.

Word	Noun	Adjective	Verb	Adverb
spider web	Yes	No	No	No
orb web	Yes	No	No	No

As nouns, orb web is a hyponym of spider web; that is, orb web is a word with a more specific, narrower meaning than spider web:

Other hyponyms of spider web include cobweb, funnel web, sheet web.

spider web (noun)	orb web (noun)
a web spun by spiders to trap insect prey	a circular spider web
a web resembling the webs spun by spiders