| Word | Definitions | Synonyms |
|---|---|---|
| froth | (noun) a mass of small bubbles formed in or on a liquid | Synonyms: foam |
| frothiness | (noun) the property of giving off bubbles | Synonyms: bubbliness, effervescence |
| frottage | (noun) masturbation by rubbing against another person (as in a crowd) | - |
| frotteur | (noun) someone who masturbates by rubbing against another person (as in a crowd) | - |