boil vs spill over

boil is a noun but spill over is not a noun.

Word	Noun	Adjective	Verb	Adverb
boil	Yes	No	Yes	No
spill over	No	No	Yes	No

As verbs, spill over is a hyponym of boil; that is, spill over is a word with a more specific, narrower meaning than boil:

Other hyponyms of boil include bubble over, overflow, ferment, sizzle.

boil (noun)	spill over (noun)
the temperature at which a liquid boils at sea level
a painful sore with a hard core filled with pus

boil (verb)	spill over (verb)
immerse or be immersed in a boiling liquid, often for cooking purposes	overflow with a certain feeling
come to the boiling point and change from a liquid to vapor	be disgorged
bring to, or maintain at, the boiling point
be in an agitated emotional state
be agitated