Titter
Part of speech: noun
Definition: A nervous or repressed giggle.
Part of speech: verb
Definition: To laugh or giggle in a somewhat subdued manner.
Giggle
Part of speech: verb
Definition: To laugh gently or in a high-pitched voice; to laugh in a silly or giddy way.
Part of speech: noun
Definition: A high-pitched, silly laugh.Amusement.
Example sentence: What is important is the reliability of my posts being there to greet my fans with a smile or a giggle every morning. That's how we keep on growing.