A segfault has similarities to an abort, but the importance of the distinction isn't so much in how they're expressed as in the circumstances under which they occur. When someone says "my Rust program crashed", that usually indicates the program deliberately terminating because of a detected or deliberately-unhandled logic bug (like divide-by-zero), which casts no aspersions on the memory-safety of the program. Less frequently "my Rust program crashed" can mean an abort (e.g. because of panicking during unwinding, or because of deliberately turning off unwinding to translate all panics to aborts), but that also has no repercussions for the memory-safety of the program. But if you do get a segfault from a Rust program, that's a big deal, and in Rust terms one would be explicit and say "my Rust program segfaulted" rather than "my Rust program crashed", which leaves no ambiguity as to the severity of the implications.