Oscillate, osmosis, ostensive, osteopath and ostracize are words. They begin with the letters OS.

Children learn grammar through exposure to language in their environment. They imitate and practice the language they hear, gradually internalizing the rules and patterns of grammar naturally. This process is supported by their innate ability to detect patterns and rules in language.

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern OS-E-S---. That is, nine letter words with 1st letter O and 2nd letter S and 4th letter E and 6th letter S. In alphabetical order, they are:

ostensive

ostensory

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 3 words with the pattern OS-E----E. That is, nine letter words with 1st letter O and 2nd letter S and 4th letter E and 9th letter E. In alphabetical order, they are:

ostensive

osteocyte

osteotome

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 5 words with the pattern O---N-I-E. That is, nine letter words with 1st letter O and 5th letter N and 7th letter I and 9th letter E. In alphabetical order, they are:

offensive

ordinaire

organzine

osmundine

ostensive