- has → possesses - wide → comprehensive - range → array - applications → functions - various → varied - fields → sectors
"Disk Space: 10 GB free disk space or more" → same as above. Gaussian 09W 9.5 Revision D.01 Free Download
Make sure the spintax is applied to each word individually. For example, "is applied to study the structure and function of biomolecules..." becomes is utilized to study the structure and operation of organic compounds... - has → possesses - wide → comprehensive
"Chemistry: The software is used to investigate chemical reactions, mechanisms, and properties of molecules." "Chemistry: The software is used to investigate chemical
Also, check for phrases that might be better as a whole, but the instruction is word by word. So "study the structure" becomes examine the composition... but maybe split into individual words.
Now, looking at the user's original text, I need to identify all the terms that can be swapped. Proper nouns are "Gaussian 09W", "Gaussian 09W 9.5 Revision D.01", and "Gaussian Inc." These should stay as they are. The rest are terms that can be replaced with three synonyms each.