dozens of
Synonym discussion
Sense: determiner/1
Many is the most neutral and widely used quantifier for large numbers, fitting comfortably in both speech and formal writing. Lots of is more informal and conversational — natural in spoken English but best avoided in academic essays. Numerous leans formal and is common in reports and scholarly articles; it can feel stiff in casual chat. Dozens of is more vivid than many: it paints a picture of countable items in groups, and implies the number is high enough to be noteworthy without sounding overwhelming. Scores of is more literary and old-fashioned, suggesting very large numbers with a slightly dramatic or rhetorical tone — you might read it in a novel or a newspaper editorial, but rarely hear it in everyday conversation.
Etymology
Dozen entered English from Old French dozeine ('a group of twelve'), which derived from Latin duodecim ('twelve'). By the 1500s, the plural form dozens of had loosened its strict tie to the number twelve and became an indefinite quantifier meaning 'a large but unspecified number'. The emphatic use — stressing that a number far exceeds what was stated or expected — developed later and is now common in everyday English.