The difference between -er and Frequentative
-er is also suffix with the meaning: a person or thing that does an action indicated by the root verb.
Frequentative is also noun with the meaning: any of a subclass of imperfective verbs that denote a repeated action, no longer productive in english, but found in e.g. finnish, latin, russian, and turkish.
Frequentative is also adjective with the meaning: serving to express repetition of an action.
check bellow for the other definitions of -er and Frequentative
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Frequentative as an adjective (grammar):
Serving to express repetition of an action.
Examples:
"Crackle" is an English frequentative verb derived from "crack"."
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Frequentative as a noun (grammar):
Any of a subclass of imperfective verbs that denote a repeated action, no longer productive in English, but found in e.g. Finnish, Latin, Russian, and Turkish.