Paiwan Every Day 561: bi / uma / ema / ba / rigi

cf. Paiwan Every Day 546: ba / rigi / uma / ema.

bi: horse (Min.) (Ferrell, p. 64). 

There are at least five words listed in different dictionaries for horse in Paiwan. What does this mean?

neka tja pacucunan a rigi i pasa maza tjanuitjen. 

Free translation: 

Horse  is not seen by us at our place. [We don't have horses in our place.]

Word gloss: 

1. neka: no, not, or there is no, NEG
2. tja: our, 1st person PL GEN, the subejct of the UV verb
3. pa-cu-cun-an: the thing that is seen, UV. pa- 'to cause to be or to occur'; the root is cun 'see' in RED; -an 'nominalization'. 
4. a: subject case marker
5. rigi: horse. Synonymous with uma/ema/ba and bi. 
6. i: in or at, LOC
7. pasa: towards the direction
8. maza: here or this way
9. tjanuitjen: with us or by us or at us

Voice file: 

From Raleigh Ferrell's Paiwan Dictionary (1982), ILRDF Online Paiwan Dictionary rigi, and klokah.