A — 1: ὄναρ
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(Strong's #3677 — Noun Neuter — onar — on'-ar )

is "a vision in sleep," in distinction from a waking vision, Matthew 1:20; 2:12,13,19,22; 27:19 .

A — 2: ἐνύπνιον
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(Strong's #1798 — Noun Neuter — enupnion — en-oop'-nee-on )

is, lit., "what appears in sleep" (en, "in," hupnos, "sleep"), an ordinary "dream," Acts 2:17 . For synonymous nouns, see VISION.

B — 1: ἐνυπνιάζομαι
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(Strong's #1797 — Verb — enupniazo — en-oop-nee-ad'-zom-ahee )

akin to A, No. 2, is used in Acts 2:17 , in the Passive Voice, in a phrase (according to the most authentic mss.) which means "shall be given up to dream by dreams," translated "shall dream dreams;" metaphorically in Jude 1:8 , of being given over to sensuous "dreamings," RV, AV, "dreamers," and so defiling the flesh.