The noun πολεμος (polemos) means war (Matthew 24:6, Hebrews 11:34, 11:7), battle (Luke 14:31, 1 Corinthians 14:8, Revelation 9:7) or conflict (James 4:1). It is used 19 times in the New Testament, see full concordance, and from it derives:

The verb πολεμεω (polemeo), meaning to wage war. This verb is used 7 times; see full concordance.