Preschool children who hear parents use specific words describing the size and shape of different objects and then repeat them do much better on tests of spatial skills than those kids who don't hear such words.
http://www.ummid.com/news/2011/November/11.11.2011/specific_words)on_kids_skill.htm
http://www.ummid.com/news/2011/November/11.11.2011/specific_words)on_kids_skill.htm