There are numerous possibilities here but discussion should arise around the following points:

1. Synonymy – are two signs ever completely synonymous given the aspect of connotation (e.g.

   SASL:	sit1 vs. sit2 in assignment 3, or
   Auslan:	sleep1 http://​media​.auslan​.org​.au​/mp4video​/32​/32140​_1​.mp4
   	sleep2 http://​media​.auslan​.org​.au​/auslan​/32​/32090​.mp4)?

   Are the synonyms possibly related to dialectal variation?

2. Polysemy – how does this work in the productive lexicon? What is the role of mouthings, for example, in signs like NGT house and shed which are identical with respect to their manual articulation but are accompanied by different mouthings. Similar pairs that are distinguished by mouthing exist in SASL, e.g. lesson – learn; car – drive.

3. Homonymy: There is quite some discussion about what counts as real homonyms in sign languages. In ASL the signs spit - tattle http://​www​.lifeprint​.com​/asl101​/pages​-signs​/t​/tattle​.htm are articulated very similarly but seem to be linked to a general meaning of projectile. The ASL signs beer - brown http://​www​.lifeprint​.com​/asl101​/pages​-signs​/b​/beer.htm are very similar to each other. These are two separate lemmas.

4. Hyponomy: probably in every sign language e.g. animal – cat, fruit – apple.

5. Antonymy: probably in every sign language, e.g. hot – cold, old – young; here it may be interesting to investigate whether some antonym pairs are characterized by opposing movement.