Question

Find out the incorrectly spelled word

• A. commissioner
• B. caterpiller
• C. idler
• D. controller

Hint:

Remember that 'caterpillar' ends similarly to 'pillar' (a stone column), which is spelled with an 'a' (-ar), not an 'e'.

Answer 1

The Correct Option is B

Concept: English spelling configurations frequently rely on specific suffix endings like '-er' versus '-ar' or '-ar' versus '-piller'. Double letters are another common area where spelling errors are introduced.

Step 1: Analysis of option constraints.
Let us inspect the component layout of every term given:

• Option (A) commissioner: Spelled correctly. It contains a double 'm' and a double 's', ending with the agent suffix '-er'. A commissioner is a member of a commission or an official in charge of a department.

• Option (B) caterpiller: Spelled incorrectly. The correct word for the larval form of a butterfly or moth is spelled

caterpillar. The terminal ending must use an 'a' instead of an 'e'.

• Option (C) idler: Spelled correctly. It refers to a person who passes time in a lazy or unproductive way, derived from the root verb 'idle' with the agent marker '-er'.

• Option (D) controller: Spelled correctly. It contains a double 'l' following a short vowel and terminates with '-er'. It denotes a person or thing that directs or regulates something.

Step 2: Determining the precise correction.
The spelling rule configuration requires a specific vowel layout for the caterpillar organism: \[ \text{Erroneous Form: } \text{c-a-t-e-r-p-i-l-l-\textbf{e}-r} \] \[ \text{Corrected Form: } \text{c-a-t-e-r-p-i-l-l-\textbf{a}-r} \] Therefore, Option (B) contains the incorrect spelling.