Related by context. Frequent words. (Click for all words.) 51 laughter 49 liken pregnant illegal immigrants 47 Hee hee 46 releases endorphins 46 Laughter 45 Shrieks 45 Whooo 45 Oooooh 44 heh heh heh 44 behavioral neuroscience 44 Mar ty 44 Nooooo 43 Awwww 43 Noooo 43 raucous laughter 43 cackles 43 Cheers applause 43 Tickling 43 Squeals 42 Hip hip hooray 42 yowls 42 Sniffles 42 Frans de Waal 42 Chalfie 42 pumpin 42 Mmmmmm 42 laughed hysterically 41 Sa rah 41 tingly feeling 41 cackled 41 laugh 41 Ooooh 41 tittered 41 peals 41 Ha ha ha ha 41 Ewwww 41 Ig Nobel 41 belly laugh 41 Oooo 41 Aaah 41 uproarious laughter 41 Whoo 41 Ooooooh 41 HA HA HA 40 Eww 40 Ro ger 40 Sweden Karolinska Institute 40 cackling 40 aaah 40 cackle 40 Heh heh heh 40 yip 40 community AABB SmartBrief 40 vocalisations 40 rats 40 hormone cortisol 40 Oohs 40 neurophysiology 40 wooo 40 laughs 40 awwww 40 Sarcastic 39 contagiously 39 whoopee cushion 39 Boom boom 39 Omigod 39 LAUGHTER 39 Awww 39 fart joke 39 laughing uproariously 39 Growling 39 Boomer Sooner 39 relieves stress 39 farted 39 suppresses appetite 39 Awwwww 39 guffaw 39 thegirlwho.net 39 titters 39 laughin 39 noradrenaline 39 Aaaah 39 hearty laughter 39 PALCA 39 Italy coul 39 hysterical laughter 39 anandamide 39 endorphin rush 39 ha ha 39 tingled 39 stimulated emission 39 belly laughs 39 genetically altered mice 39 yippee 39 Brain Behavior 39 whoops 39 laughing hysterically 39 transduction 39 HA HA HA HA 39 Shrieking 39 zebra finch