Progressive clue challenge

How quickly can you identify the hidden word?

Begin with a broad grammatical clue. Reveal more only when needed. Fewer clues and fewer wrong guesses produce a higher score.

100
It is used as a noun.
It begins with “A” and contains 9 letters.
Definition: The common bistort or snakeweed (Polygonum bistorta).
It ends with “T”.
Clue 1 of 4 is visible.
Another word