It's a bit of a tricky one because "investigation" is formed by adding the suffix "-ation" to the verb "investigate." However, "investigate" itself is the root word, meaning to inquire into or examine something systematically.
It's a bit of a tricky one because "investigation" is formed by adding the suffix "-ation" to the verb "investigate." However, "investigate" itself is the root word, meaning to inquire into or examine something systematically.