What is the key rule for membership in the following set: screeched, scratched, scrounged, scrunched, stretched, straights, and strengths. (all with nine letters).
Etymology, Etymology, and more Etymology
as well as grammar, usage, euphemism, slang, jargon, semantics (meaning), linguistics, neologism, idiom, word origin, syntax, dialect, lexicon (vocabulary), diction, pidgin, synonym, antonym, homonym, cant, argot, lingo, and redundancy.

The critically-acclaimed board game MooT consists of tough questions about the nuances of the English language.
Answer: they are the longest one-syllable English words
Others in the OED: scraughed, scrinched, scritched, scrooched, sprainged, spreathed, throughed, and thrutched.
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