• upcurves,
• upcurvee,
• upcurb,
• upcarve,
• upzurve,
• upkurve

• upbeat,
• upshot,
• uptick,
• uprising,
• upward,
• uphill,
• upheaval,
• uplift,
• upturn,
• upgrade.

The adjective form of "upcurve" is "upcurved".

The plural form of "upcurve" remains the same, as it is not commonly used in the plural form.

The singular form of the word "upcurve" is "upcurve". The word remains the same in both singular and plural form.