Postgres full-text search with synonyms

I have a database of restaurants which I do a full-text search on. The code looks something like this:

SELECT * FROM restaurant WHERE restaurant.search_vector @@ plainto_tsquery(:terms);

And search_vector is defined like this:

alter table restaurant add column search_vector tsvector;
create index restaurant_search_index on restaurant using gin(search_vector);
create trigger restaurant_search_update before update or insert on restaurant
    for each row execute procedure
    tsvector_update_trigger('search_vector',
    'pg_catalog.english','title');

Now, a notable problem with this search is the word barbecue. It can be spelled many different ways: barbecue, barbeque, BBQ, B.B.Q., B-B-Q, etc. When somebody searches any of these, I need to search restaurants for all of these terms.

From what I've read online, it seems I need to modify the dictionary (That would be pg_catalog.english, right?), but I'm not sure how to go about this.