sym ‧ pa ‧ thiz ‧ er BrE AmE ( also sympathiser British English ) /ˈsɪmpəθaɪzə $ -ər/ noun [countable]
[ Word Family: noun : ↑ sympathy , ↑ sympathizer ; verb : ↑ sympathize ; adverb : ↑ sympathetically ; adjective : ↑ sympathetic ≠ ↑ unsympathetic ]
someone who supports the aims of an organization or political party SYN supporter :
The anti-abortion rally attracted many sympathizers.