A person who supports or pursues a policy of expansion, especially territorial or economic growth and influence.
From 'expansionism' + '-ist' (noun-forming suffix meaning one who practices/believes in). Names advocates of expansion ideologies.
Expansionists can be peaceful (a tech company expanding into new markets) or bellicose (nations seeking territorial conquest), so the term carries no inherent moral judgment.
Complete word intelligence in one call. Free tier — 50 lookups/day.