Chuckle is as fun to say as it is to do. In fact, just the sound of the word chuckle may make you feeling like chuckling, or laughing softly.
Chuckle is one of many words for different kinds of laughter. These include giggle, titter, snicker, and a word that is a cross between chuckle and snort — chortle. These words are all imitative. That is, the word itself sounds like the noise it refers to. With all these words for laughter, it may be hard to choose the right one for the occasion. Use chuckle when you mean a quiet, even soundless laugh.