different between therewithal vs whereunder

English

there +? withal

therewithal (not comparable)

in addition; besides; with all this/that
- 1874, Ernest Myers (transl.), The Extant Odes of Pindar, translated into English, Olympian Ode I, page 5.
  […] the Father hath hung above him a mighty stone that he would fain ward from his head, and therewithal he is fallen from joy.

where +? under

whereunder (not comparable)

(archaic) Under which or what.
- 1911, David Graham Phillips, The Conflict, ch. 8,
  The real bottom cause of the change was the "gentlemen's agreement" between the two party machines whereunder both entered the service of the same master.

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