a grassroots movement: popular,
of-the-people, bottom-up, nonhierarchical...
the most basic level of an activity or organization
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a brunch...
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laugh is the general term
the others are all different ways of laughing.
Someone who chuckles at a joke laughs a little...
To giggle is to laugh softly, often with the hand covering the mouth
and tends to be associated with silliness.
Tittering is very similar to giggling, but perhaps softer, sort
of like the sound of many birds chirping together. In fact, it sometimes
occurred with another birdlike sound, cooing.
To snicker at someone is to laugh briefly, often secretly (hand over mouth), and sarcastically.
To guffaw is to laugh loudly.
To snort is to laugh and suck in air at the same time, making a sound similar to the grunting of a pig.