specialists

/S P EH1 SH AH0 L AH0 S T S/
noun
  1. 1

    Someone who is an expert in, or devoted to, some specific branch of study or research.

  2. 2

    A physician whose practice is limited to a particular branch of medicine or surgery.

  3. 3

    Any of several non-commissioned ranks corresponding to that of corporal.

  4. 4

    An organism that is specialized for a particular environment.

    โ€œThe tree Lepidothamnus laxifolius is a high alpine specialist found in high-altitude bog communities and in scrub.โ€

Source: https://en.wiktionary.org/wiki/specialist, https://en.wiktionary.org/wiki/specialists