Twig
Part of speech: noun
Definition: A small thin branch of a tree or bush.
Part of speech: verb
Definition: To realise something; to 'catch on'.
Example sentence: I do not want to die... until I have faithfully made the most of my talent and cultivated the seed that was placed in me until the last small twig has grown.
Sprig
Part of speech: noun
Definition: A small shoot or twig of a tree or other plant; a spray.A youth; a lad; -- used humorously or in slight disparagement.A brad, or nail without a head.A small eyebolt ragged or barbed at the point.