There are 6 definitions of -er in English:

-er1

Syllabification: -er

suffix

1Denoting a person, animal, or thing that performs a specified action or activity: farmer sprinkler
2Denoting a person or thing that has a specified attribute or form: foreigner two-wheeler
3Denoting a person concerned with a specified thing or subject: milliner philosopher
4Denoting a person belonging to a specified place or group: city-dweller New Yorker

Origin

Old English -ere, of Germanic origin.

Definition of -er in:

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Word of the day impudicity
Pronunciation: ˌimpyəˈdisitē
noun
lack of modesty

There are 6 definitions of -er in English:

-er2

Syllabification: -er

suffix

Forming the comparative of adjectives (as in bigger) and adverbs (as in faster).

Origin

Old English suffix -ra (adjectival), -or (adverbial), of Germanic origin.

Definition of -er in:

There are 6 definitions of -er in English:

-er3

Syllabification: -er

suffix

Forming frequentative verbs such as glimmer, patter.

Origin

Old English -erian, -rian, of Germanic origin.

Definition of -er in:

There are 6 definitions of -er in English:

-er4

Entry from British & World English dictionary

suffix

Forming nouns used informally, usually by distortion of the root word: footer rugger

Origin

probably an extended use of -er1; originally Rugby School slang, later adopted at Oxford University, then extended into general use.

Definition of -er in:

There are 6 definitions of -er in English:

-er5

Syllabification: -er

suffix

Forming nouns:
1Such as sampler. Compare with -ar1.
[ending corresponding to Latin -aris]
1.1Such as butler, danger.
[ending corresponding to Latin -arius, -arium]
1.2Such as border.
[ending corresponding (via Old French -eure) to Latin -atura]
1.3Such as laver. See laver2.
[ending corresponding (via Old French -eor) to Latin -atorium]
2 equivalent to -or1.

Origin

via Old French or Anglo-Norman French (see above).

Definition of -er in:

There are 6 definitions of -er in English:

-er6

Syllabification: -er

suffix

chiefly Law
(Forming nouns) denoting verbal action or a document effecting such action: disclaimer misnomer

Origin

from Anglo-Norman French (infinitive ending).

Definition of -er in: