Augur vs Protend - What's the difference?

As a noun augur

is augur (diviner who foretells events by the behaviour of birds), especially in the context of ancient rome.

(obsolete) to hold out; to stretch forth.

(wikipedia augur)

(en noun)

A diviner who foretells events by the behaviour of birds or other animals, or by signs derived from celestial phenomena, or unusual occurrences.

* Dryden

Augur of ill, whose tongue was never found / Without a priestly curse or boding sound.

(Ancient Rome) An official who interpreted omens before the start of public events.

To foretell events; to exhibit signs of future events.

To anticipate, to foretell, or to indicate a favorable or an unfavorable issue.

to augur well or ill

* augury

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(en verb)

(obsolete) To hold out; to stretch forth.

With his protended lance he makes defence. — Dryden.

(Webster 1913)