plodder

noun

1. someone who walks in a laborious heavy-footed manner

   noun.person

   Synonyms slogger trudger

   Source: WordNet 3.0

2. someone who works slowly and monotonously for long hours

   noun.person

   Synonyms slogger

   Source: WordNet 3.0

3. someone who moves slowly

   noun.person

   Synonyms slowcoach slowpoke stick-in-the-mud

   Source: WordNet 3.0

4. One who plods; a drudge.

   noun

   Source: webster1913