However, you can use suffixes to modify the meaning of "perilous" or create related words:
* -ly: This creates an adverb: perilously (meaning "in a dangerous way")
* -ness: This creates a noun: perilousness (meaning "the state of being dangerous")
It's also possible to use other suffixes to create related words, but they might be less common or more specific:
* -ize: This creates a verb: perilize (meaning "to make something dangerous")
* -ation: This creates a noun: perilization (meaning "the act of making something dangerous")
Ultimately, the best suffix depends on the specific meaning you want to convey.