How to register brother in hebrew tattoo
The word you’re looking for is “ach” (with a German-like “ch” consonant). It is actually spelled Alef Chet, as Hebrew is written from right to left.
Its different usages are similar to its English equivalent, “brother”.
Other words that are derived from this word How to register brother in hebrew tattoo:
achot [אחות]: “sister”
achva [אחווה]: “brethren”, “brotherhood”
achi [אחי]: “my brother”, also functions as a slang equivalent to “mate”, or “dude”.