fConsonants

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/f/

/θ/

Same: ·

Dental /θ/ vs labiodental /f/. Some accents merge these.

think ↔ finkthree ↔ freethaw ↔ fourthought ↔ fought

/f/

/v/

Same: ·

Voiceless /f/ vs voiced /v/. Teeth on lower lip for both — only voicing differs.

fan ↔ vanfine ↔ vinefast ↔ vastsafe ↔ save