Denshi Jisho — Online Japanese dictionary

そく gear; speed (as in 4 speed automatic transmission and such)
Suffix 
かそく 1: acceleration; speed up;
2: (Noun or verb acting prenominally) accelerator
Common word, Noun, Suru verb 
じそく speed (per hour)
Common word, Noun 
そくど speed; velocity; rate
Common word, Noun 
そっき shorthand; stenography
Common word, Noun, Suru verb, No-adjective 
はやい 1: fast; quick; hasty; brisk;
2: early (in the day, etc.); premature;
3: (too) soon; not yet; (too) early;
4: easy; simple; quick
Common word, Adjective 
はやく 1: early; soon;
2: quickly; swiftly; rapidly; fast
Common word, Adverb 
はやさ 1: speed; velocity; quickness; rapidity;
2: earliness
Common word, Noun 
そくほ 1: quick pace; quick steps; quick march;
2: trot (horse gait)
Noun 
ちそく speed; progress
Noun 
なにわ Naniwa (former name for Osaka region)
Noun 
はやめ 1: early;
2: fast
No-adjective 
はやめ 1: early;
2: fast
No-adjective 
びそく very slow speed
Noun 
かいそく high speed; celerity; mobility; express (train that bypasses many stations)
Common word, Na-adjective, Noun, No-adjective 
げんそく deceleration
Common word, Noun, Suru verb, No-adjective 
こうそく 1: high speed; high gear;
2: (Abbreviation) highway; freeway; expressway; motorway
Common word, Na-adjective, Noun, No-adjective 
さっそく at once; immediately; without delay; promptly
Common word, Adverb 
しっそく stall (in flying)
Common word, Noun, Suru verb 
じんそく quick; fast; rapid; swift; prompt; streamlined; expedited; expeditious
Common word, Na-adjective, Noun 
せっそく hasty; rough and ready
Common word, Na-adjective, Noun 
そくたつ express; special delivery
Common word, Noun, Suru verb 
そくほう news flash; prompt report; bulletin; quick announcement
Common word, Noun, Suru verb 
そっこう 1: swift attack; quick attack; fast break;
2: (Adverb) (Colloquialism) right away; without delay; immediately
Common word, Noun, Suru verb, No-adjective 
びんそく quickness; agility; activity
Common word, Na-adjective, Noun 
ふうそく wind speed
Common word, Noun 
おんそく speed of sound
Noun 

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