from 3308; to be anxious about:

KJV-- (be, have) care (-ful), take thought.

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3308 merimna (mer'-im-nah);

from 3307 (through the idea of distraction); solicitude:

KJV-- care.

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3307 merizo (mer-id'-zo);

from 3313; to part, i.e. (literally) to apportion, bestow, share, or (figuratively) to disunite, differ:

KJV-- deal, be difference between, distribute, divide, give participle

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3313 meros (mer'-os);

from an obsolete but more primary form of meiromai (to get as a section or allotment); a division or share (literally or figuratively, in a wide application):

KJV-- behalf, course, coast, craft, particular (+-ly), part (+-ly), piece, portion, respect, side, some sort (-what).