BE A BETTER ANAGRAMMER XXIII

All the words in each set below are one-letter off from a single, "parent word."  For example, ETHIC, HITCH, and THICK are all one-letter off spellings of the letters in ITCHY. Can you determine the parent word for each set below?*

1. DENIAL, HANDLE, INHALE
2. EDITOR, TIRADE, DIETER, TIERED
3. VANITY, ADVENT, TAVERN, INVITE
4. CANDOR, CANDID, CINDER, RACING DARING, CARING

Answers:

The parent words are:

1. LINEAR
2. ADROIT
3. NATIVE
4. RANCID

*NOTE: The "parent word" is optional. Any of the one-letter off words could have been chosen.