• rech runs,
• fech runs,
• gech runs,
• yech runs,
• 6ech runs,
• 5ech runs,
• twch runs,
• tsch runs,
• tdch runs,
• trch runs,
• t4ch runs,
• t3ch runs,
• texh runs,
• tevh runs,
• tefh runs,
• tedh runs,
• tecg runs,
• tecb runs,
• tecn runs,
• tecj runs

The adjective form of "tech runs" would be "technological".

The plural form of "tech runs" is still "tech runs".

The singular form of the word "tech runs" is "tech run"