• calback,
• falshback,
• callbck,
• callbak,
• feelback,
• ballbark,
• fawlback,
• dallback,
• falback,
• fallack,
• fallbak,
• fallbac,
• fallbakc,
• fillback,
• fahlback,
• fallbeck,
• fallbakk,
• finnback,
• follback,
• wahleback

• fullback,
• fall back on,
• fall back.

The adjective form of "fallback" is "fallback". It remains the same in both the noun and adjective forms.

The plural of the "fallback" can be the "fallbacks".

The singular of the "fallback" can be the "fallback".