The best replacement for captain is commander.

The best alternatives to captain are rated as following:

★★★★★	commander
★★★★★	major
★★★★	admiral
★★★★	lieutenant
★★★	captain
★★★	colonel
★★	skipper
★★	pilot
★	crew
★	guardian lotro
★	champion lotro
★	major higher
★	general
★	colonel higher
★	chief
★	first officer
★	lieutenant higher
★	sergeant
★	colonel higher rank
	general higher
	knight evony
	commander which is higher rank
	guardian
	sergeant higher
	jaitley
	espada
	lieutenant rank
	corporal
	sargent

Your alternative for captain is not listed? Suggest!

Speaking about captain, one probably shouldn't forget about ship.

Other search terms related to captain and their ratings are:

★★★★★	ship
★★	crew

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captain

commander

major