senso

This is the fence of the band, and it is one letter wide.Senco is a sense in the sense of a meaning: what a word or a sentence signifies. Senso is a sense in the sense of a faculty: sight, hearing, smell, taste, touch. English uses one word for both and has been getting away with it for centuries. Esperanto refuses, and puts a c against an s to make you choose.

Which is which, and how to keep it that way. Senco has the c and goes with words: la senco de la frazo, the meaning of the sentence, and sensenca, meaningless, which is sen plus senc plus a and is a good mnemonic in itself because a meaningless remark is nothing to do with your eyes. Senso has the s and goes with the body: la kvin sensoj, sensa organo, sensa plezuro. If you can say whether the thing in question could be damaged by an illness, it is a senso.

The rest of each family, because the derivatives keep the split. From senso: sensa sensory, senseco sensitivity, sensilo a sense organ or a sensor, ekstersensa for the paranormal claims. From senco: senca meaningful, sencohava making sense, sensenca its opposite. And standing behind both is senti, to feel, which is the Latin verb they both descend from and which quietly explains why they were ever confusable.