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Only seven words place S second and T third, and two of them differ by a single letter.
An aster is a daisy like garden flower and an ester is a compound formed from an acid and an alcohol. One is horticulture and the other organic chemistry.
Only the opening letter divides them, and both are perfectly ordinary within their own field. If a puzzle confirms everything after the first box, you are guessing between A and E.
E takes three of the seven, A takes two, and I and O take the remaining two. A consonant in front of ST does not produce a word at this length.
ASTIR means up and moving about. OSTIA are small openings in a body or a vessel, ESTOP is a legal verb meaning to bar someone from asserting something, and ISTLE is a stiff plant fibre used for cord.
ASTER or ASTIR. Both turn up in general writing, while ESTER is confined to chemistry and the rest are specialist.
A long thrusting sword designed to pierce mail armour. It is a term from historical weaponry.
To prevent someone by law from making a claim that contradicts their earlier position. Estoppel is the noun.
A tough fibre from agave and yucca plants, made into rope, brushes and matting. It comes mainly from Mexico.