My rhyming dictionary says:

plinth, helminth, colocynth, terebinth

yeesh - I'm going to have to look those up...

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plinth - n.

1. A block or slab on which a pedestal, column, or statue is placed.

2. The base block at the intersection of the baseboard and the vertical trim around an opening.

3. A continuous course of stones supporting a wall. Also called plinth course.

4. A square base, as for a vase.

hel·minth - n.

A worm, especially a parasitic roundworm or tapeworm.

col·o·cynth - n. In both senses also called bitter apple.

1. A tendril-bearing Old World vine (Citrullus colocynthis) bearing yellowish, green-mottled fruits the size of small lemons.

2. The fruit of this plant, whose dried, bitter, spongy pulp is a very strong laxative.

ter·e·binth - n.

A small Mediterranean tree (Pistacia terebinthus) that is a source of tanning material and turpentine.