Hap and Haply

hap

An accidental happening.
- usage: "he recorded all the little haps and mishaps of his life"

Come to pass.
- usage: "What is happening"; "The meeting took place off without an incidence"; "Nothing occurred that seemed important"
- synonyms: happen, go on, pass off, occur, pass, fall out, come about, take place

(v.t.) To clothe; to wrap.
(v.i.) To happen; to befall; to chance.
(n.) That which happens or comes suddenly or unexpectedly; also, the manner of occurrence or taking place; chance; fortune; accident; casual event; fate; luck; lot.
(n.) A cloak or plaid.

Webster's Revised Unabridged Dictionary

(Military) HAP stands for humanitarian assistance program

Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.

haply

By accident.
- usage: "betrayed by a word haply overheard"
- synonyms: by chance, by luck

(adv.) By hap, chance, luck or accident; perhaps; it may be.

Webster's Revised Unabridged Dictionary