stem vs stemmer

stem and stemmer both are nouns.

Word	Noun	Adjective	Verb	Adverb
stem	Yes	No	Yes	No
stemmer	Yes	No	No	No

stem (noun)	stemmer (noun)
a turn made in skiing; the back of one ski is forced outward and the other ski is brought parallel to it	a device for removing stems from fruit (as from grapes or apples)
front part of a vessel or aircraft	a miner's tamping bar for ramming packing in over a blasting charge
the tube of a tobacco pipe	an algorithm for removing inflectional and derivational endings in order to reduce word forms to a common stem
cylinder forming a long narrow part of something	a worker who makes or applies stems for artificial flowers
(linguistics) the form of a word after all affixes are removed	a worker who strips the stems from moistened tobacco leaves and binds the leaves together into books
a slender or elongated structure that supports a plant or fungus or a plant part or plant organ

stem (verb)	stemmer (verb)
stop the flow of a liquid
remove the stem from
grow out of, have roots in, originate in
cause to point inward