Contend – (n.) To struggle in opposition, as in competition or fight.
God used Contend 25 times in Scripture: 23 times to Israel in their Masoretic Text Old Testament; once to Israel in the transition book of Acts; and twice to Israel in their tribulation.
Contentious – (adj.) Obstinate, quarrelsome person causing or involved in controversy.
God used Contentious 5 times in Scripture: 3 times in the book of Proverbs; and twice to the Body of Christ.