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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, sillyAdv: seriously, immediately, regularly, carefully, seldomВообще слова cough, sneeze, pain, swallow, hurt, nod - можно отнести и к сущ. и к глаголам