The crossword solution for the term SUFFIX WITH QUART is ETTE, which is a four-letter word. The suffix -ette is derived from French and is used to form diminutive nouns. It is often used to indicate smallness or femininity, such as in the words kitchenette, usherette, and launderette. The suffix is also used to denote a unit of measure, such as quartette, which is a unit of measure equal to one quarter of a gallon.