What's the difference between tergiversate and tergiversator?

Tergiversate

Definition:

• (v. i.) To shift; to practice evasion; to use subterfuges; to shuffle.

Example Sentences:

• (1) His writings writhed and ached with twists and turns and tergiversations, inept words, fanciful repetitions, far-fetched verbosity and long, Latin-based words."

Tergiversator

Definition:

• (n.) One who tergiversates; one who suffles, or practices evasion.

Example Sentences:

• (1) His writings writhed and ached with twists and turns and tergiversations, inept words, fanciful repetitions, far-fetched verbosity and long, Latin-based words."