Synonyms of 'backlog'
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An accretion is an addition to something, usually one that has been added over a period of time.
The larger the animal, the greater the accretion of poison in the fat.
An accumulation of something is a large number of things which have been collected together or acquired over a period of time.
accumulations of dirt
Thesaurus for backlog from the Collins English Thesaurus
A backlog is a number of things which have not yet been done but which need to be done.