Was Keturah Abraham's wife?

[TonyChanYT]

Genesis 25:

1 Abraham had taken another wife, whose name was Keturah.

wife
אִשָּׁ֖ה (’iš·šāh)
Noun - feminine singular
Strong's 802: Woman, wife, female

H802 is ambiguous. It is a high-frequency word with 781 occurrences.

Good News Translation:

Abraham married another woman, whose name was Keturah.

This translation is confirmed in 1 Chronicles 1:

32a The sons born to Keturah, Abraham’s concubine

Now, this Hebrew word is different from "wife".

concubine
פִּילֶ֣גֶשׁ (pî·le·ḡeš)
Noun - feminine singular construct
Strong's 6370: A concubine, a paramour

Appears 37 times only.

Sarah was Abraham's wife. After her death, Abraham took Keturah as his concubine or secondary wife.