Giggle, chortle (5)
I believe the answer is:
laugh
I believe this is a double definition.
'giggle' is the first definition.
(thesaurus)
'chortle' is the second definition.
(I've seen this before)
(Other definitions for laugh that I've seen before include "Cachinnate" , "Guffaw" , "Audible expression of amusement" , "Show amusement or pleasure" , "Express amusement audibly" .)