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auspicious

showing signs that promise success

introspection

examination of one's own thoughts and feelings

retrospect

a survey of past times or events

specimen

a single thing that is taken as an example of a whole category

specter

a ghost; a haunting fear of future trouble

spectrum

the distribution of characteristics of a physical system, especially bands of colors seen as a rainbow or bands of differing sound waves

speculate

to form opinions without definite knowledge or evidence; to buy or sell something to make a profit but with risk of loss

surveillance

supervision or close observation, especially of a suspected person

vigil

a period of staying awake to keep watch or to pray

vigilant

watchful; on the lookout for danger

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