Synonyms of the word 
SPEEDBOAT → MOTORBOAT - POWERBOAT
speedboat
- n. A fast boat, usually small (for 1-8 people).
- n. A boat designed and built for racing.
- n. A boat used for waterskiing.
- v. (intransitive) To travel by speedboat.
motorboat
- n. (nautical) Any vessel driven by an engine (either inboard or outboard), but especially a small one.
- v. (slang) To place one's head between a woman's breasts and make the sound of a motorboat with one's lips…
powerboat
- n. A small, fast motorboat.
If you are interested in words, visit the following sites :
- wiktionary.org/speedboat For complete definition of a word
- 1word.ws/speedboat to play with words, suffixs, prefixs, etc.