lag vs slowdown

lag and slowdown both are nouns.

Word	Noun	Adjective	Verb	Adverb
lag	Yes	No	Yes	No
slowdown	Yes	No	No	No

As nouns, lag and slowdown are synonyms defined as:

Other synonyms of lag include retardation.

lag (noun)	slowdown (noun)
the act of slowing down or falling behind	the act of slowing down or falling behind
one of several thin slats of wood forming the sides of a barrel or bucket
the time between one event, process, or period and another

lag (verb)	slowdown (verb)
throw or pitch at a mark, as with coins
cover with lagging to prevent heat loss
hang (back) or fall (behind) in movement, progress, development, etc.
lock up or confine, in or as in a jail