• 高校こうこう — high school
• 最高さいこう — the best
• 高度こうど — altitude / advanced
• 高級こうきゅう — high-class / luxury
• 高速こうそく — high speed
• 標高ひょうこう — elevation / altitude
• 声高こわだか — loud-voiced / outspoken
• 物価高ぶっかだか — prices are high

高 is common in school names, product rankings, and prices. It adds weight to anything marked as “high” in value, level, or position.