stream vs spill over

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

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

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

Other hyponyms of stream include pour out, spill out.

stream (noun)	spill over (noun)
the act of flowing or streaming; continuous progression
a steady flow of a fluid (usually from natural causes)
dominant course (suggestive of running water) of successive events or ideas
a natural body of running water flowing on or under the earth
something that resembles a flowing stream in moving continuously

stream (verb)	spill over (verb)
exude profusely	overflow with a certain feeling
flow freely and abundantly	be disgorged
to extend, wave or float outward, as if in the wind
move in large numbers
rain heavily