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..."prostitute". Both words are suffixed by "-stitute", but obviously the meaning are quite different. "Substitute" is a conceptual, mental and intelligent activity, whilst "prostitute" is a profitable, body (mostly) and sensual activity. In my opinion, they don't have any reasonable relationships! So why do they spell so similar?

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restitution, destitute, constitute, institute, prostitute, and substitute all derive ultimately from the same Latin verb. Prostitute: that which is put beforethat which is offered for salethose who sell themselves. Substitute: that which is put underthat which is put in place ofthose who replace others. –  Peter Shor Jan 15 at 22:50
    
Although your comment is far more clearer than the answer, I still feel your pointers jumping too fast. However with reading your comment and the answer I think I have got the idea. Thanks you both! –  Earth Engine Jan 15 at 23:59
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Re: your title. I think that's something the substitute would prefer to keep private. ;-) –  Jim Jan 16 at 2:44
    
Like my latest edit? :) –  Earth Engine Jan 16 at 6:03
    
No, it's not a good edit. –  martin f Jan 16 at 7:17

1 Answer 1

up vote 10 down vote accepted

They are related by situation. Both are derived from the Latin root word, to stand.

One stands before (exhibited), one stands under or next to (in place of).

prostitute: from Latin prostitutus, (expose publicly, as in for sale) from pro-: before + statuere: cause to stand, establish, to put, place.

Used from the 1520s, to offer to indiscriminate sexual intercourse (usually in exchange for money).

substitution: from Latin; put in place of another, place under or next to, present, submit, from sub "under" + statuere: set up, to stand with derivatives meaning place or thing that is standing

Used since late 14c., appointment of a subordinate or successor

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