1 Kings 15:6 KJV (With Strong’s)

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6
And there was war
milchamah (Hebrew #4421)
a battle (i.e. the engagement); generally, war (i.e. warfare)
KJV usage: battle, fight(-ing), war((-rior)).
Pronounce: mil-khaw-maw'
Origin: from 3898 (in the sense of fighting)
between Rehoboam
Rchab`am (Hebrew #7346)
a people has enlarged; Rechabam, an Israelite king
KJV usage: Rehoboam.
Pronounce: rekh-ab-awm'
Origin: from 7337 and 5971
and Jeroboam
Yarob`am (Hebrew #3379)
(the) people will contend; Jarobam, the name of two Israelite kings
KJV usage: Jeroboam.
Pronounce: yaw-rob-awm'
Origin: from 7378 and 5971
all the days
yowm (Hebrew #3117)
a day (as the warm hours), whether literal (from sunrise to sunset, or from one sunset to the next), or figurative (a space of time defined by an associated term), (often used adverb)
KJV usage: age, + always, + chronicals, continually(-ance), daily, ((birth-), each, to) day, (now a, two) days (agone), + elder, X end, + evening, + (for) ever(-lasting, -more), X full, life, as (so) long as (... live), (even) now, + old, + outlived, + perpetually, presently, + remaineth, X required, season, X since, space, then, (process of) time, + as at other times, + in trouble, weather, (as) when, (a, the, within a) while (that), X whole (+ age), (full) year(-ly), + younger.
Pronounce: yome
Origin: from an unused root meaning to be hot
of his life
chay (Hebrew #2416)
alive; hence, raw (flesh); fresh (plant, water, year), strong; also (as noun, especially in the feminine singular and masculine plural) life (or living thing), whether literally or figuratively
KJV usage: + age, alive, appetite, (wild) beast, company, congregation, life(-time), live(-ly), living (creature, thing), maintenance, + merry, multitude, + (be) old, quick, raw, running, springing, troop.
Pronounce: khah'-ee
Origin: from 2421
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Cross References

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there was war.Instead of Rehoboam fourteen MSS., the Arabic, and some copies of the Targum, read Abijam.
The Syriac has "Abia, the son of Rehoboam;" and the Editio Princeps of the Vulgate has Abia. This is doubtless the true reading, as otherwise it would be an unnecessary repetition of ch. 14:30, and a repetition which interrupts the history of Abijah:
(see 2 Ch 13:3, etc.)

J. N. Darby Translation

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6
And there had been war between Rehoboam and Jeroboam all the days of his life.