A — 1: μόχθος
(Strong's #3449 — Noun Masculine — mochthos — mokh'-thos )

"labor, involving painful effort," is rendered "travail" in 2—Corinthians 11:27 , RV (AV, "painfulness"); in 1—Thessalonians 2:9; 2—Thessalonians 3:8 it stresses the toil involved in the work.

A — 2: ὠδίν
(Strong's #5604 — Noun Feminine — odin — o-deen' )

a birth pang, "travail pain," is used illustratively in 1—Thessalonians 5:3 of the calamities which are to come upon men at the beginning of the Day of the Lord; the figure used suggests the inevitableness of the catastrophe. See PAIN , No. 2, SORROW.

B — 1: ὠδίνω
(Strong's #5605 — Verb — odino — o-dee'-no )

akin to A, No. 2, is used negatively in Galatians 4:27 , "(thou) that travailest (not)," quoted from Isaiah 54:1; the Apostle applies the circumstances of Sarah and Hagar (which doubtless Isaiah was recalling) to show that, whereas the promise by grace had temporarily been replaced by the works of the Law (see Galatians 3:17 ), this was now reversed, and, in the fulfillment of the promise to Abraham, the number of those saved by the Gospel would far exceed those who owned allegiance to the Law. Isaiah 54 has primary reference to the future prosperity of Israel restored to God's favor, but frequently the principles underlying events recorded in the OT extend beyond their immediate application.

Galatians 4:19 Galatians 4:8Revelation 12:2 Isaiah 66:7 Micah 5:2,3Matthew 24:21Revelation 7:14Revelation 12:2 Jeremiah 30:7
B — 2: συνωδίνω
(Strong's #4944 — Verb — sunodino — soon-o-dee'-no )

"to be in travail together," is used metaphorically in Romans 8:22 , of the whole creation.

B — 3: τίκτω
(Strong's #5088 — Verb — tikto — tik'-to )

"to beget," is rendered "travail" in John 16:21 .