Group the words into 4 categoties: n, v, adj, adv: excite, seriously, throat, immediately, cough, sneeze, recover, serious, blood, pain, silly, worry, tongue, swallow, hurt, nod, fall, examine, regularly, lung, chest, carefully, seldom

N-throat.blood.pain.tongue.lung.chest.
cough.sneeze.nod.hurt.
V-cough.sneeze.recover.swallow.hurt.
nod.fall.examine.worry.
Adj.-excite.serious.
Adv.seriously.immediately.silly.regularly.carefully.seldom.

N: throat, cough, blood, pain, tongue, lung, chest,
V: excite, cough, sneeze, recover, worry, swallow, hurt, nod, fall, examine,
Adj: serious, silly
Adv: seriously, immediately, regularly, carefully, seldom
Вообще слова cough, sneeze, pain, swallow, hurt, nod - можно отнести и к сущ. и к глаголам