What is the meaning of -tar?

forms agent nouns. -er

forms relational adjectives. -al

Used to create adjectives and nouns that denote demonyms.

Forms feminine agent or occupational nouns

Forms the female counterpart of nouns indicating a person.

Signifies habitual behaviour.

Autonomous ending of first conjugation verbs in the present tense, present subjunctive mood, and conditional mood

Source: wiktionary.org