-mus

See also: Appendix:Variations of "mus"

Finnish edit

-m- +‎ -us

-mus (front vowel harmony variant -mys, linguistic notation -mUs)

Forms nouns from verbs. Variant of -us used with sallia-type verbs, and those muistaa and sanoa-type verbs whose stem consists of one syllable; the "m" is used to fill the gap as adding just "-us" would sound awkward.
‎tutkia (“to study, explore, investigate”) + ‎-mus → ‎tutkimus (“research, investigation”)

‎luottaa (“to trust”) + ‎-mus → ‎luottamus (“trust”)
Forms names for people and things from stems.
‎yli- (“over, upper”) + ‎-mus → ‎ylimys (“aristocrat”)

‎surkea (“miserable”) + ‎-mus → ‎surkimus (“weakling”)

‎pyhä (“holy”) + ‎-mus → ‎pyhimys (“saint”)

‎iso (“large”) + ‎-mus → ‎isomus (“large gold nugget”)

compounds

From -m- +‎ -us. Akin to Finnish -mus.

-mus (front vowel variant -ys)

Used to form action nouns from verbs: -ing
‎kysy- (“to ask”) + ‎-mus → ‎kysymys (“question”)

Declension of -mus (type 2/petos, no gradation)
	singular	plural
nominative	-mus	-mukset
genitive	-muksen	-muksiin
partitive	-musta, -must	-muksia
illative	-muksee	-muksii
inessive	-muksees	-muksiis
elative	-muksest	-muksist
allative	-mukselle	-muksille
adessive	-mukseel	-muksiil
ablative	-mukselt	-muksilt
translative	-mukseks	-muksiks
essive	-muksenna, -mukseen	-muksinna, -muksiin
exessive¹⁾	-muksent	-muksint
¹⁾ obsolete ^) the accusative* corresponds with either the genitive (sg) or nominative (pl) ^) the comitative** is formed by adding the suffix -ka^? or -kä^? to the genitive.

From Proto-Samic [Term?].

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-mus (with odd-syllable stems -eamọs)