The best replacement for main idea is theme.

The best alternatives to main idea are rated as following:

★★★★★	theme
★★★	topic
★★★	topic sentence
★★	summary
★	details
★	detail
★	supporting details
★	central idea
★	thesis
★	thesis statement
	main topic
	plot
	summarizing
	implied main idea
	central point is always directly stated
	purpose
	controlling idea
	supporting detail
	big idea
	supporting idea
	topic sentences

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Speaking about main idea, one probably shouldn't forget about nonfiction text.

Other search terms related to main idea and their ratings are:

★★★★★	nonfiction text
★	informational text

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main idea

theme

topic