• speedbump,
• speedly,
• speakup,
• speeden,
• speep,
• speedos,
• speekup,
• spead up,
• speed up-,
• speededup,
• apeedup,
• zpeedup,
• speddup,
• speerup,
• speedsup,
• speeedup,
• speedupp,
• speadup,
• sferdrup,
• Splegut

• speed up,
• spit up,
• speedboat,
• speed bump.

The adjective form of the word "speedup" is "speeded-up". Another possible alternative is "accelerated".

The plural of the "speedup" can be the "speedups".

The singular of the "speedup" can be the "speedup".