The word 'whaler' is a straightforward English compound formed from the noun 'whale' and the agent-forming suffix '-er'. Its core meaning, "a person or ship that hunts whales", follows a common and transparent English pattern, as seen in words like 'hunter' or 'sailor'. The term 'whale' itself descends from the Old English hwæl, a term for any large sea creature, which can be traced back to a Proto-Indo-European root. The secondary, informal meaning of 'whaler' to describe a large, strong person is a direct metaphorical extension from the immense size and power of the whale, demonstrating how animal characteristics are often mapped onto human attributes in language.

Structure: whale (large marine mammal) + er (agent noun suffix) - whale: From Old English hwæl, meaning "large fish, whale". A word of Germanic origin, ultimately from Proto-Indo-European (s)kwal-o-, meaning "large sea fish". - er: A suffix of Germanic origin (Old English -ere) used to form agent nouns indicating "a person or thing that performs an action".