Denshi Jisho — Online Japanese dictionary

ガタガタ rattle; clatter
Common word, Na-adjective, Adverb, Adverb taking the 'to' particle, Suru verb, No-adjective, Onomatopoeic or mimetic word 
がっかり feel disappointed; dejected; lose heart; feel emotionally drained; feel let down
Common word, Adverb, Noun, Suru verb, Adverb taking the 'to' particle, Onomatopoeic or mimetic word 
がっくり heartbroken; crestfallen
Common word, Adverb, Noun, Suru verb, Adverb taking the 'to' particle, Onomatopoeic or mimetic word 
がっしり firmly; solidly; tough
Common word, Adverb, Noun, Suru verb 
がっちり solidly built; tightly; shrewd; calculating
Common word, Adverb, Noun, Suru verb 
がぶがぶ gulping down; guzzling
Common word, Na-adjective, Adverb, Noun, Onomatopoeic or mimetic word 
ガボット gavotte
Common word, Noun, fre: 
ガメラン gamelan (traditional Indonesian music ensemble)
Common word, Noun, ind: 
がやがや noisily; in a crowd of people talking; clamorously; in a hubbub
Common word, Adverb, Adverb taking the 'to' particle, Suru verb, Onomatopoeic or mimetic word 
がらんと empty; deserted
Common word, Adverb, Suru verb, Onomatopoeic or mimetic word 
ガリウム gallium (Ga)
Common word, Noun, No-adjective 
ガリバー 1: Gulliver;
2: preeminent example of its kind
Common word, Noun 
ガリレオ Galileo
Common word, Noun 
ガレージ garage (at house)
Common word, Noun 
ガンガン sound of large bell; sound of scolding voice; (pounding of) headache; intense
Common word, Adverb, Suru verb, Colloquialism, Onomatopoeic or mimetic word 
ガーデン garden
Common word, Noun 
ガイアナ Guyana
Noun, No-adjective 
ガイスト spirit (ger: Geist)
Noun 
ガウチョ gaucho
Noun 
ガガイモ rough potato (Metaplexis japonica)
Noun, Usually written using kana alone 
がくがく body trembling; teeth clattering; something coming loose
Na-adjective, Adverb, Noun, Suru verb, Onomatopoeic or mimetic word 
ガクガク body trembling; teeth clattering; something coming loose
Na-adjective, Adverb, Noun, Suru verb, Onomatopoeic or mimetic word 
ガクブル to tremble; to shiver (from stress, fear or panic); (figuratively) to experience a sense of stress, fear, or panic
Suru verb, Abbreviation, Onomatopoeic or mimetic word 
がくんと suddenly; with a jerk
Adverb, Onomatopoeic or mimetic word 
がさごそ rustling sound
Noun, Noun or verb acting prenominally 
ガザニア gazania (esp. species Gazania rigens)
Noun, lat: 

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