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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Groan at, maybe:

PUNNY: Producing groans, maybe
IRK: Cause to groan, maybe
CORNIER: Inducing more groans, maybe
CORNY: Groan-inducing, maybe
REACTTO: Groan at, maybe
PUN: Groan-inducing joke, maybe
DAD: Word groaned after a bad pun, maybe