Sis and Ti

Sis noun - A female person who has the same parents as another person.

Ti is a synonym for sis. In some cases you can use "Ti" instead a noun "Sis".

Ti noun - A light strong grey lustrous corrosion-resistant metallic element used in strong lightweight alloys (as for airplane parts); the main sources are rutile and ilmenite.

Sis is a synonym for ti. Sometimes you can replace term "Sis" with "Ti", this nouns are similar.