Help/advice with Foriegn keys

I'm doing some initial design work on a small (hopefully fairly simple) reference database.

In one small part of the DB I've got a table, called for the sake of convenience here, ENTITIES.

Table entities has key IIN smallint(3) - there shouldn't be more than about 120 entries and as it's a reference table in a reference database it's unlikely to ever change, or even grow. If anything it's actually likely to shrink.

Entities also has a field name char(30), and here is where I need a bit of advice/assistance. Most entities are also referenced by a short form, synonym, and a few have a number of synonyms. I've found one with 8 synonyms but most only have 1 or sometimes 2.

Question.