The term 'make plain' can be defined as making something easier to understand. There are several crossword solutions that can be used to DEMONSTRATE this concept, such as 'DEMONSTRATE' (11 letters), 'ELUCIDATE' (9 letters), 'EXPLICATE' (9 letters), 'EXPLAIN' (7 letters), 'ILLUSTRATE' (10 letters), 'CLARIFY' (7 letters), 'EVINCES' (6 letters), 'REVEAL' (6 letters), 'spellout' (8 letters), and 'cleartheair' (11 letters). Each of these words implies a different way of making something easier to understand, such as demonstrating through an example, elucidating by providing more detail, explicating by providing a thorough explanation, explaining by providing a brief overview, illustrating by providing a visual representation, clarifying by providing a concise explanation, evincing by providing evidence, revealing by uncovering the truth, spelling out by providing a literal explanation, and clearing the air by resolving a misunderstanding.