talker

As an adjective taller

is (tall).

As a noun talker is

a person who talks, especially one who gives a speech, or is loquacious or garrulous.

As an adjective talkative

is tending to talk a lot.

As a noun talker is

a person who talks, especially one who gives a speech, or is loquacious or garrulous.

As nouns the difference between talker and nontalker

is that talker is a person who talks, especially one who gives a speech, or is loquacious or garrulous while nontalker is one who is not a talker; an untalkative person.