• highhgi,
• hightih

• high tide,
• highway,
• highly,
• highlight,
• High Chair,
• height,
• highball,
• hike.

The adjective form of the word "high" is "high". It is the same in both its adjective and adverb forms.

The plural form of the word "highhigh" is "highhighs".

The singular form of the word "highhigh" is "high"