What is a word group?

Literature and art, civil and military, arts and sciences, articles, literary circles, documents, culture and education, literary talents, texts, documents, the Cultural Revolution, Brunei, refinement, literary garden, selected works, abstracts, bras, documents, styles, diplomas, ornaments, stationery, civilization, texts, literary history, literary thoughts, literary studies, literature, grammar, writing. Illiteracy, cultural relics, astronomy, hydrology, slow fire, gentleness, writing, graphics, writing, manuscripts, writers, scholars, sven, Tibetan, gentle and gentle sweeping the floor, ...