(forming nouns) denoting a person or thing performing the action of a verb, or denoting another agent.‘escalator’
From Latin, sometimes via Anglo-Norman French -eour or Old French -eor (see also -ator).
Forming adjectives expressing a comparative sense.‘major’
Via Anglo-Norman French from Latin.
Forming nouns denoting a state or condition.‘error’
From Latin, sometimes via Old French -or, -ur.