giggle vs have a laugh

giggle

verb

To laugh gently in a playful, nervous, or affected manner.

noun

Fun; an amusing episode.
A high-pitched, silly laugh.

have a laugh

verb

To laugh.
To joke; kid around.
To enjoy oneself; have fun.

How often have the words giggle and have a laugh occurred in a corpus of books? (source: Google Ngram Viewer )