The term 'periods' can refer to a variety of different concepts. The crossword solutions for this term include 'ENDS' (4 letters), 'spells' (6 letters), 'ERA' (3 letters), 'DOTS' (4 letters), 'EONS' (4 letters), 'ERAS' (4 letters), 'EPOCHS' (6 letters), 'stages' (6 letters), and 'seasons' (7 letters). These words all refer to different lengths of time, from the very short (DOTS) to the very long (EONS). Additionally, 'timeframes' (10 letters) is another word that can be used to refer to periods of time.