Ail

Etymology 1
From Old English eġlan, eġlian "to trouble", akin to Gothic 𐌰𐌲𐌻𐌾𐌰𐌽:.

Noun

 * 1) An ailment; trouble; illness.

Verb

 * 1)  To cause to suffer; to hurt; to trouble; to afflict.
 * What ails him? &mdash; What's wrong with him?
 * 1)  To be ill; to suffer; to be troubled.

Etymology 2
From Old English eġl.

Noun
ail


 * 1) The awn of barley or other types of corn.

Thesaurus
ache; afflict; agonize; anguish; be affected with; be the matter; beset; bite; blanch; blench; bother; burn; chafe; complain of; complicate matters; concern; convulse; crucify; cut; discommode; distress; disturb; excruciate; feel ill; feel pain; feel the pangs; fester; fret; gall; give pain; gnaw; grate; grimace; grind; gripe; harass; harrow; have a misery; hurt; inconvenience; inflame; inflict pain; irk; irritate; kill by inches; labor under; lacerate; martyr; martyrize; nip; pain; perplex; perturb; pierce; pinch; plague; pother; pound; prick; prolong the agony; put out; put to it; put to torture; puzzle; rack; rankle; rasp; rub; shoot; shrink; smart; stab; sting; suffer; thrill; throb; tingle; torment; torture; trouble; try; tweak; twinge; twist; twitch; upset; vex; wince; worry; wound; wring; writhe