What is the meaning of -or?

Creates an agent noun, often from a verb, indicating a person or object (often machines or parts of them) that do the verb or part of speech with which they are formed.

Appended to the names of members of classes of components, especially those that have an extensive property name of the same root suffixed with -ance

Used to form nouns of quality, state, or condition.

forms relational adjectives and demonyms

forms agent nouns

forms many names for months

used to create abstract nouns from adjectives; -ness

used to create abstract nouns from adjectives; -ness

Attaches to an adjective denoting a physical property to form the associated abstract noun.

A plural marker, used on feminine gender nouns ending with an unstressed -e [-a].

suffix forming adjectives from verbs denoting tendency or causation

Suffix variant found on masculine a-stem nouns

forms comparative adverbs

-er, suffix used to form agent nouns

-ness, indicates a quality, a characteristic

Used to denote the future infinitive of a verb.

used to form a third-declension masculine abstract noun from a verb root or conceived root form

first-person singular present passive indicative of

first-person singular present passive indicative of

forms augmentatives

Suffix appended to words to create a masculine noun, usually denoting a profession or a performer, used chiefly for words of Latin origin.

forms abstract nouns from adjectives

Used to create agent nouns from verbs

A plural marker. This marker is the regular plural for common gender nouns ending with an unstressed -a. Such an -a disappears when -or is added. The marker is used, however, with a few other nouns as well.

person or man associated with root

Source: wiktionary.org