The best replacement for byte is bit.

The best alternatives to byte are rated as following:
★★★★★  bit
★★★  word
★★  char
★★  byte
★  int
★  bite
★  kilobyte
★  char oracle
★  gigabyte
★  megabyte
★  octet
★  giga byte
★  sound bite
★  bit which is smaller
★  character
★  byte java
  mega byte
  char java
  kilobyte bigger
  bits
  int java
  32 byte
  char c#
  3baysgsa
  string
  uint8_t
  kilo byte
  unicode
  unsigned char
  64 byte
  nibble

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Speaking about byte, one probably shouldn't forget about bits.

Other search terms related to byte and their ratings are:
★★★★★ bits
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byte
bit
word