precarious vs perilous

precarious and perilous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
precarious	No	Yes	No	No
perilous	No	Yes	No	No

As adjectives, precarious and perilous are synonyms defined as:

Other synonyms of precarious include parlous, touch-and-go.

precarious (adjective)	perilous (adjective)
fraught with danger	fraught with danger
not secure; beset with difficulties
affording no ease or reassurance